Vibration mechanism for screens



March 8, 1927.'Y 1,620,213

- E. T. KEENAN VIBRATION MECHANISM FOR SCREENS Filed Se'pt. 25. 19249.0.0.0; lui

Patented Mar. 8, 1927.

UNITED STATES EDWARD T. KEENAN, `Olli" BREWSTER, FLORIDA. Y

VIBRATION MECHANISM A non SCREENS.

Application filed September 25, 1924. Serial No. 739,789.

vide a sifting screen with an improved elec-k tromagnetically operatedvibratory mechanism for vibrating the screen.

More specifically the invention contemplates the vibration Vof a sifterscreen by a polarized plunger which is vibrated by alternating thedirection of an external magnetic field to which the plunger issubjected. y

In the accompanying drawings, there is shown, for purposes ofillustrating the invention, two of the many possible embodiments of thevibratory mechanism contemplated by the present invention, together witha vibratory screen actuated thereby, it being understood the drawingsare merely illustrative of the invention, which may be embodied invarious forms.

In these drawings:

Fig. 1 is a side elevation of a screen and vibratory operatingmechanism, parts be ing broken away.

- Fig. 2 is an end view, taken from the right of Fig.` 1.

Fig. 3 is a section taken on the line 3-3 of Fig. 1, parts beingomitted.

Fig. 4 is a detached view showing a screen coupling device; and

Fig. 5 illustrates a modified form of magnet structure.

The vibratory screen may be mounted on any convenient stationarysupporting frame. A convenient form of supporting frame may be made fromangle iron, as shown in the drawings. This frame has a base made up of apair of longitudinal angles 10 and 11 connected by cross braces 12. Therear of the supporting frame is made up of a pair of vertical members13, (only one of which appears in the drawing) and a cross member 14, atthe front of the base there are two front vvertical members 15 (only oneof which appears in the drawing) which are stiffened by a cross brace16. The rear cross member 14 supports bearing members 17, which arepivotally supported bysimilar bearing members 18 carried underneath ascreen frame 19. The lower end of the screen frame is` carried betweenthe uprights 15, the screen frame and uprights being slotted as shown at2O and 21, so that the screen frame may be adjustably clamped inposition by bolts 22. It is, of course, intended that the screen beprovided with suitable chutes for delivering the material to be screenedand for caring for the sifted material andthe tailings, but these areomitted from the drawings for purposes of clearness. Y

The screen frame 19 carries a screen 23 made up of a suitable piece ofscreen metal 24 and side clamping and shield members 25, 25, and 26,26a, shown more in detail in Figure V4. Suitable tensioning devices 27are provided for stretching the screen metal. The above describedmounting of the screen on the screen frame is, of course, only one ofthe many ways in which it may be conveniently mounted.

The screen frame 19 is provided, at about the middle of its length, withtrans versey members 28 and 29, shown in the form of channels, which mayconveniently be carried above the screen frame by means f the vibratoryoperating mechanism for agi- K,

tating the screen.

A transverse shaft 32 is mounted in bearings 33 carried on bearingsupports 34 fastened to the transverse members 2S and This shaft isadapted to be power driven in any suitable manner, and is provided witha multipolar magnet structure 35. This structure is provided withexciting windings 3G so as to give the alternate piece 41 it attached toits upper end pref lll erably by `a tapered thread and a pin, as show-n.

The plunger is preferably energized by a solenoid coil 42 disposedbetween the channels 28 and 29 so that a strong niagnetic pole isproduced at the ends of the plunger. The lower end of the plunger isprovided with an anvil block -43 adapted to engage an anvil block 44supported from the transverse `frame in iany convenient manner, yas by abridge 45. This bridge is provided lwitha tubular `member 46 lthreadedat its upper end to receive a threaded plug 47 This plug provides aconvenient means vfor controlling the tension in a spring 4S housedinside the tubular member and upper yanvil block.

The coil 42 may be energized from any suitable source, and is shown asbeing placed in 'parallel with the windings of the rotary magnetstructure. lt may, however, be connected in series, or one may generatethe Iexciting current directly in the rotating structure, therebyrendering any external connection unnecessary.

The residual magnetism in the plunger, when the coil 42 is disconnected,is in some cases -suiiicient to cause the vibration, as the plunger isattracted by the rotating magnetic structure, and the weight of thescreen and load and the spring forces the screen downward as theyiniiuence ceases. rl`here is also lin some cases sufficientself-polarization -to cause the screen to vibrate when the magnets arertated.

The shaft 32 Ais adapted to be rotated at a convenient speed by anysuitable source of power, Anot shown. The rotation of the shaft carriesthe alternate north and south polesof the magnet structure past the polepiece 41 and thereby subjects it to the influence ofthe alternation ofthe magnetic field induced =by the rotating magnet structure. The coil42 lpolarir/.es fthe plunger in a predetermined manner. `When `the poleof `rotating ymagnet' structure is 'like the pole at the upper Iendofthe Iplunger the niagnetic repulsion forces the plunger down wardly,this movement being, to some extent lassisted by the spring 48. lilhen,hovever, the rotating structure has turned to place the 'nent poleadjacent the pole piece of the plunger, the poles are unlike, and, Suchpoles attract, the plunger is brought upwardly. rlhe upward movement ofthe plunger is limited by the engagement of the anvil blocks 43 and 44,thereby preventing'the pole 4l from reaching the vrotating magnetstructure. As rotation of the shaft 32 causes a rapid change in themagnetic field, this results in a rapid vibration of the plunger andwhatever is attached to it. l1 the 'present case it causes a rapidvibration ofthe screen and agitates the material in a vigorous fashion.The speed may readily l'be controlled, and the device may be operated byeither direct or alternating current.

In the modified form of magnet structure shown in Figure 5, thetransverse frame Ymembers 28 and '29 carry laminated strips 50 and lwhose upper ends 53 and 54 are adapted to be inagnetized by inductionfrom a rotating magnet The lower ends and 56 of the strips 50 and 5l arebrought close together thereby providing a better electromagneticcircuit, and the polo piece 4l'on the plunger 40 is disposed just belowsaid lower ends 55 and 56. The plunger will be alternately attracted andi'epelled as before.

lt is obvious that the invention may be embodied in many forms andconstructions, and I wish it to be understood that the particular formsshown are but a few of the inanyforms. Various modifications and changesbeing' possible, l do not limit myself `in any iay with respect thereto.

That is claimed is:

l. ln combination, a supporting frame, a screen frame adjustably mountedon the supporting frame, a screen cari'ied from the screen frame, aniagnetizable plunger attac-hed to the screen and electromagnetic meansfor vibrating the plunger, 'icluding a rotatable magnet struct-urebodily carried by the screen frame, said rotatable 'magnet structurealternately attracting and `i'epelling the plunger.

In combination, a supporting frame, a screen frame :djustably mounted onthe supporting frame, a screen carried from the screen frame, ainagnetizable plunger attached to the screen, screen-frame supA portedguiding means for the plunger, and electromagnetic means for vibratingthe plunger, including a rotatable magnet structure bodily carried bythe screen frame, said rotatable magnet structure alternately attractingand repelling the plunger.

3. In combination, a supporting frame, a screen frame adjustably mountedon the supporting frame, a screen carried from thc screen frame, amagnetizable plunger attached to the screen and Vextending upwardlythereiironi, electromagnetic means for vibrating the plunger, includinga `rotatable magnet structure bodily carried 'by the screen frame, andmeans for limiting the upward movement of the plunger, said rotatablemagnet structure `altei'natelv attracting and repelling thc plunger.

4. ln combination, a supporting iframe, a screen. frame adjustablymounted on the supl'iorting frame, a screen carried from the screenframe, a inagnetizable plunger attached to the screen, a rotatableshaftbodily carried by the screen frame, and electro` magnetic means forvibrating the plunger. including a magnet structure carried by theYshaft `to rotate therewith, said rotatable V lli() lill magnetlstructure alternately attracting and repelling the plunger.

` 5. In combination, a screen trame, a screen carried by the frame, aplunger connected to the screen to vibrate the screen, and means tovibrate the plunger, comprising a stationary solenoid surrounding theplunger to magnetize it, and a rotatable magnet structure disposedadjacent the tree end ot the plunger to subject the plunger to theinfluence of the alternation of the magnetic field as the magnetstructure is rotated whereby the plunger is vibrated.

6. In combination, a screen frame, a screen carried by the trame, aplunger connected `to the screen to vibrate the screen, and

means to vibrate the plunger, comprising a stationary solenoidsurrounding the plunger to magnetize it, and a rotatable magnetstructure disposed adjacent the free end of the plunger to subject theplunger to the infiuence of the alternation of the magnetic field as themagnet structure ris rotated whereby the plunger is vibrated, saidrotatable magnet structure being supported from the screen frame.

7. In combination, a screen trame, a sci'een carried by the 'rame,a-plunger connected to the screen to vibrate the screen, and means tovibrate the plunger, comprising a stationary solenoid surrounding theplunger to magnetize it, a transverse shaft rotatably carried above thescreen trame, and a magnet structure carried on the sha-tt and disposedadjacent the tree end of the plunger `to subject the plunger to theinfluence ot the alternation ot the magnetic field as the magnetstructure is rotated whereby the plunger is vibrated. y Y Y 8. Incombination, a screen frame, a screen carried by the frame, a plungerconnected to the screen to vibrate the screen, and means to vibrate theplunger, comprising a stationary solenoid surrounding the plunger to.magnetize it, a transverse shaft rotatably carried above the screentrame, a magnet structure carried on the shaft and disposed adjacent thefree end of the plunger toV subject the plunger to the inuence of thealternation of the magnetic field as the magnet structure is rotatedwhereby the plunger is vibrated, exciting windings for the magnetstructure and collector rings for connecting the windings to an externalcircuit.'

9. In combination, a screen traine, a screen carried by the frame, aplunger connected to the screen to vibrate the screen, and means tovibrate the plunger, comprising a stationary solenoid surrounding theplunger to magnetize it, a transverse shaft rotatably carried by thescreen frame above the screen, and a magnet structure carried on theshaft and having alternate north and south poles adapted to be broughtadjacent the free end of the plunger.

10. In combination, a screen frame,-'a screen carried by the traine, aplunger Aconnected to the screen to vibrate the screen,

Vand means to vibrate the plunger, comprising a stationary solenoidsurrounding the plunger to magnetize it, a transverse shatt rotatablycarried by the screen trame above the screen, a magnet structure carriedVon the Ashaft and 'having alternate north and south poles adapted to bebrought adjacent the free end of the plunger, exciting windings for themagnet structure and collector rings for connecting the windings-to anexternal circuit.

11. In combination, a traine, a multipolar magnet structure rotatablysupported from the frame, a polarized armature reciprocably carried bysaid iframe in a position to be attracted or repelled by the magneticfield induced by the magnet structure, and a screen connected to thearmature to be vibrated thereby.

l2. In combination, a trame, a niultipolar magnet structure rotatablysupported from the frame, av polarized armature reciprocably carried bysaid frame in a position to be attracted or repelled by thel magneticfield induced by the magnet structure, an energizing coil for thearmature, and a screen connected to the armature to be vibrated thereby.

18. In combination, a trame, a sha-tt rotatably carried on the trame, ainultipolar magnet structure having alternate north and south poles andcoupled to the shaft, exciting windings for the magnet structure,collector rings for connecting the windings to an external circuit, apolarized armature carried on the frame in a position to heA alternatelyattracted and repelled when the magnet structure4 is rotated, and adevice attached to the free end ot the armature to be vibrated thereby.

lll. In combination, a frame, a shaft rotatably carried on the frame, amultipolar magnet structure having alternate north and south poles andcoupled to the shaft, exciting windings for the magnet structure,collector rings for connecting the windings to an external circuit, apolarized armature carried on the vtrame in a position to be alternatelyattracted and repelled when the magnet structure is rotated, amagnetizing coil for the armature in parallel with the excitingwindings, and a device attached to the free end of the armature to bevibrated thereby.

15. In combination, an obliquely disposed screen carried on a trame, aplunger connected to the free part of the screen, and guided forreciprocation perpendicular to the screen, a solenoid coil formagnetizing said plunger so that its free end has a predeterminedpolarity, a magnet structure rotatably carried adjacent the free end ofthe IIU Cil

plunger and 'having alternate -north and south poles, and means torotate said struc* ture whereby the .plunger .is alternately Aattractedand repelled.

16. In combination, an obliquely disposed screen carried on a frame, `aplunger connected to the free part ot the screen, and guided forreciprocation perpendicular 4to the screen, a .solenoid coil formagneti-Zing said plunger so `that its rtree end has a predeterminedpolarity, a magnet structure rotatably carried adjacent the free end ofthe plunger and having alternate north and south poles, means to rotatesaid structure whereby the plunger is alternately attracted andrepelled, and means to prevent the plunger and magnet structure 'fromcoming in contact.

17. In combination, a screen, a strap carried underneath the screen, aplunger attached to the strap and extending perpendicularly above thescreen, means for guiding' the plunger to permit it to reciprocatelongitudinally, a solenoid coil surrounding the plunger, a pole piececarried bythe lvfree end of the plunger, a movable magnet structure, andmeans to bring alternate north and south poles adjacent the pole piecewhereby t-he pole piece is alternately attracted and repelled.

18. In combination, a screen, `a strap carried underneath the screen, aplunger attached to the strap and extending perpendicularly above thescreen, means for guiding the plunger to permitit to reciprocatelongitudinally, a solenoid coil surrounding the plunger, a pole piececarried by the free end of the plunger, and a rotatable magnet structuredisposed adjacent the free end of the plunger to subject the plunger tothe influence of the alternationoif the magnetic field as the magnetstructure is lrotated whereby the plunger is vibrated.

19. In combination, a screen, a strap car- :reed-'2113 longitudinally, asolenoid coil surrounding the plunger, a pole piece carried by the freeend of the plunger, and a rotatable ymagnet structure disposed adjacentJthe tree end oi the plunger to subject the plunger to the influence ofthe alternation of the magnetic field as the magnet structure is rotatedwhereby the plunger is vibrated, said rotatable magnet structui-'e beingsupported Afrom the screen frame.

20. In combination, a screen frame, a screen carried by the iframe,transverse trame members carried from the screen frame above the screen,a plunger whose lower end is attached to the screen, guiding `means forthe plunger supported from the transverse members, a shaft rotatablysupported from the frame and carried above the transverse members, amagnet structure having alternate north and south poles and mounted onthe shaft, in line with the free end of lthe plunger, and a solenoidcoil to energize the plunger.

2l. In combination, la screen yframe, a screen carried by the trame,transverse frame members carried from the screen 'frame above thescreen, a plunger whose lower end is attached to the screen, guidingmeans for the plunger supported 'from the transverse members, a sha'ttrotatably supported from lthe frame and carried above the transversemembers, a magnet structure having alternate north `and south poles andmounted on the shaft, in line with the free end oi the plunger', asolenoid coil to ener Vgize the plunger, means to limit the upwardmovement of the plunger, and a spring tending to move the plungerdownwardly.

EDWARD T. KEENAN.

